Perforated Duct Sizing

[axlegrinder]

Does anybody have any design guidelines for perforated sprial duct.

I recall that it is similar in design philosophy to gas burners, ie. even flame hieght along length, but I would like to know if there is specific criteria tying together
- duct diameter
- pressure drop per unit length along duct
- hole size versus hole cfm
- required pressure behind hole to develop cfm

I believe the best approach is to try to maintain a uniform pressure along the duct such that all holes have the same pressure behind them, but do I have to develop all this from first principles?

 

[imok2]

I believe every profession has a developed language that when it is misapplied creates an axiety on behalf of the listener. Just my observation because I really want to help

 

[KenRad]

axlegrinder,

The design guidelines for the perforated duct are product-specific; I would contact the manufacturer that you're using (McGill, Lindab, etc).

---KenRad